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Test Code CREAT Creatinine

Methodology

kinetic colorimetric assay is based on the Jaffé method

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

  • Serum.
  • Plasma Li-heparin K2-EDTA plasma.
  • Urine:   Collect urine without using additives. If urine must be collected with a preservative for other analytes, only hydrochloric acid or boric acid may be used.

•   Fluid samples:  Fluid samples (upon request) will be run for creatinine.  (Test code:  

     CREAFL.)  No Reference ranges will be provided.  Specimens that have a high         

     visual viscosity or contain fibrin clots will NOT be analyzed on the Cobas.  Credit     

     the in-house code and send to Mayo (if the testing is available).

•   Sample stability:            

Stability in serum/plasma:14

7 days at 15-25 °C

 

7 days at 2-8 °C

 

3 months at (-15)-(-25) °C 

 

 

Stability in urine (without preservative):14                            

2 days at 15-25 °C 

 

6 days at 2-8 °C

 

6 months at (-15)-(-25) °C

 

 

Stability in urine (with preservative):15

3 days at 15-25 °C

 

8 days at 2-8 °C

 

3 weeks at (-15)-(-25) °C

Reference Values

0-31 days:  0.2-0.9 mg/dL

1 month-10 years:  0.2-0.9 mg/dL

11-14 years:  0.4-0.9 mg/dL

Females ≥15 years:  0.5-0.9 mg/dL

Males ≥15 years:  0.7-1.2 mg/dL

 

Day(s) Test Set Up

Monday through Sunday